METHOD FOR OVERBURDEN DRILLING, CASING SHOE AND CASING TUBE FOR THE METHOD, AND COUPLING ELEMENT FOR THE CASING TUBES - Patent 0627040

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EP 0 627 040 A1

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(43)	Date of publication:
	07.12.1994 Bulletin 1994/49

(21)	Application number: 93905720.0

(22)	Date of filing: 25.02.1993

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International Patent Classification (IPC):

E21B 10/ 40^{( . )}
E21B 17/ 00^{( . )}
E21B 17/ 14^{( . )}
F16L 47/ 24^{( . )}

E21B 7/ 20^{( . )}
E21B 17/ 042^{( . )}
F16L 15/ 04^{( . )}

(86)	International application number:
	PCT/SE1993/000158

(87)	International publication number:
	WO 1993/017215 (02.09.1993 Gazette 1993/21)

(84)	Designated Contracting States:
	AT CH DE ES FR GB IT LI PT SE

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Priority:

25.02.1992 SE 19920000563

(71)	Applicant: EDMAN, Knut Östen
	S-135 50 Tyresö (SE)

(72)	Inventor:
	EDMAN, Knut Östen S-135 50 Tyresö (SE)

(74)	Representative: Claesson, Lennart
	Patent Ability L Claesson AB, Box 4110 S-175 04 Järfälla S-175 04 Järfälla (SE)

(54)	METHOD FOR OVERBURDEN DRILLING, CASING SHOE AND CASING TUBE FOR THE METHOD, AND COUPLING ELEMENT FOR THE CASING TUBES